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3D electrical resistivity image of the Dharwar Craton, India

Authors

Patro,  B. Prasanta K.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ajithabh,  K. s
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Babu,  Narendra
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Shiva Krishna,  Mothukuri
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Raju,  Kashi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Reddy,  K. Chinna
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Patro, B. P. K., Ajithabh, K. s., Babu, N., Shiva Krishna, M., Raju, K., Reddy, K. C. (2023): 3D electrical resistivity image of the Dharwar Craton, India, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1396


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017205
Abstract
The Archean cratons are the key to understand the crust formation, the early Earth geodynamics, and the subsequent transition to the present-day plate tectonics. Dharwar craton is a granite-gneiss-greenstone terrain, situated in the south India bounded by Deccan traps, Southern Granulite Terrain (SGT), Eastern Ghat Mobile Belts (EGMB) and Arabian Sea in north, south, east, and west respectively. The subduction-accretion (plate tectonic) models and plume-plate tectonic mixed models are proposed by various authors for the crustal evolution of the Dharwar craton. In this study, we present the 3D inversion results of magnetotelluric (MT) data from the Dharwar craton using the long period MT (LMT) measurements. The LMT data is acquired in a 3D grid fashion, covering the entire Dharwar craton. This study delivers the lateral and vertical variations in electrical resistivity of the Dharwar subsurface. The crust beneath the Dharwar craton is highly resistive in nature with few conductive zones. The conductive zones in the crust subsequently join with the upper mantle which is observed as a broad and interconnected conductive zone. Highly resistive segments that extend to the upper mantle indicates the locations of preserved lithosphere in the Dharwar craton. An anomalous conductive body is seen in the upper mantle in the north-western part of the craton. Its relations to the evolution of Dharwar craton will be discussed.